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� ,.vt:.sFC.' rs,_ 'ar d7ny . i.- - ..���� �.t:-„{�'�- -.F.��T�•�kk�`, y�. *''�' ` � _� ,GAS. <br /> '.'�'�, ; �f= r' � ;� d. , .. "Z �';"� f•,'Y::"�• Gr-,trT?• �u��'?”", c a. ��N ��- �s�fir, !� .,�'' �`� fi�z � !y.� �,i <br /> r <br /> n <br /> r^ <br /> q <br /> 1Y <br /> ~ Chevron/South Center <br /> September, 1990 <br /> SOIL BORING AND GROUNDWATER MONITORING WELL INSTALLRTION <br /> Based on the site configuration and the evidence gathered <br /> during the tank removal, Groundwater Technology proposes to drill <br /> four soil boringf; on this site. Figure 4 indicates the proposed <br /> locations of the borings for the groundwater-monitoring wells. <br /> The soil borings will be drilled using a truck-mounted drill <br /> rig equipped with 8-1/2-inch outside-diameter (O.D.) , hollow-stem <br /> augers. During drilling, a Groundwater Technology field geologist <br /> will maintain a continuous log of the soils encountered. This <br /> log will include periodic measurements of organic-vapor <br /> concentrations as indicated by field re=adings taken with a photo- <br /> ionization detector (PID) . The field geologist will also collect <br /> samples from the continuous core for possible laboratory <br /> analyses. Such samples will be collected in clean, 2-inch- <br /> �n., <br /> diameter brass tubes. The tubes will be sealed with aluminum <br /> foil, capped, and the caps secured with plastic tape to produce <br /> an air-tight seal. The samples wi. l be labeled and placed on ice <br /> in an insulated cooler for transportation to the GTEL <br /> Environmental Laboratories, Inc. (GTEL) facility in Concord, <br /> California accompanied a by Chain-of-Custody Manifest at all <br /> times. <br /> GHG `utexrER <br /> TECH NOLOGS.I\C. <br /> NIMNIMIMMI I Mammas E EN �11110NMNIIIMWNIM <br />